A new list for source code developers is now emerging
Support it. Where is it? Was it reported on wiki news or official documentation?

See http://puppylinux.org/wikka/SelfHostingPuppy . The list can be subscribed to via http://www.freelists.org/list/puppy-devel and its archives can be read at http://www.freelists.org/archives/puppy-devel/ . The list's email address is puppy-devel@freelists.org .